2 3X=0.75(1700-x)

(1)0.25x=-5x=-20(2)3x-4x=1-5x=4(3)3x-4x=18-5x=-13(4)1+7=x+7xx=1(5)9x-7x-3x=-8x=8(6)-x+3x=3-2x=1/2(7)

是这样的：x^5+x^4=x^3(x^2+x)=(x^2+x)[(x^3-1)+1]=(x^2+x)(x^3-1)+x^2+x=[x(x+1)(x-1)](x^2+x+1)+x^2+x=(x^3-x)

x+20％x=3601.2x=360x=300x+50％x=0.751.5x=0.75x=0.53分之一x-4分之一x=24分之一1/12x=1/24x=1/2x-35％x=3900.65x=390x

15x=23x-248x=24x=312+5x=3x-82x=-20x=-103(x-3)=9-(x+6)4x=9+9-6=12x=34+x=4x-173x=21x=7

原式=x^4-8x^3+13x^2+10+2x(x^2-8x+13)+(x^2-8x+13)=x^2(x^2-8x+13)+10=10分组代入后得10

（X+X)+(X-X)+(X*X)+(X/X)=1002X+0+X*X+1=1002X+X*X=99X(X+2)=99X=9再问：请问X(X+2)=99解为什么就等于9了呢没看懂再答：换成算术法你就明

解(1)x-0.75x=120.25x=121/4x=12x=12×4x=48(2)2.8x+x=7.63.8x=7.6x=7.6÷3.8x=2(3)2.36x+2.64x=185x=18x=18÷5

设x1=4-√3,x2=4+√3,是方程X^2-8X+13=0的两根所以X1^2-8X1+15=2X^4-6X^3-2X^2+18X+23=(X+1)^2*(X^2-8X+13)+10=10所以原式=

当X=51a=51/10取整=5b=51/10取余=1X=10*1+5=15所以,运行结果为15

方程是啥?如果为：x^0.75-x^0.25=0.75令t=x^0.25,则x^0.75=t^3方程化为:t^3-t=0.75,解得：t=1.26255112740716x=t^4=2.5409486

1）两边取对数,xlg23-lg4=xlg16,则x=lg4/(lg23-lg16)2）设数为x,则x-1/x=16/15,即15x²-16x-15=0,(5x+3)(3x-5)=0则x=-

5x+2x=33.6,7x=33.6;x=4.8;7x-4x=0.75,3x=3/4;x=1/4;2x+7x+2.1=12,9x=8.1;x=0.9;56x-32x-119=36124x=480;x=

0.25x=5.6（合并同类项）x=5.6/0.25（移项）x=22.4望采纳!

3.5X—1.5X=10.82x=10.8x=5.42.36X+2.64X=185x=18x=3.6X—0.75x=120.25x=12x=482.8X+X=7.63.8x=7.6x=2

百分之17=0.17百分之1=0.010.01X=0.17X-230.16X=23X=143.75

苍月Swart,你好：x-0.75x=420.25X＝42X＝42÷0.25X=168

#includesintjiesheng(intn)//用于计算阶乘如：3!{if(n=1)rerunn;returnn*hh(n-1)}doubledigui(intn,intx)//用以计算y=x

10x-3.14*x*x*0.25=3.14*x*x*0.7510x=3.14*x*x*0.75+3.14*x*x*0.253.14*x*x*(0.75+0.25)-10x=03.14*x*x-10x

2x等于x+15x等于15

X-0.75X=三分之一X-10则0.25x=(x-10)/3则0.25x*3=x-10则10=x-0.75x则0.25x=10所以x=40